/* Radreise-Forum – Design-Anpassungen auf Bootstrap 5.3 */

:root {
  --rf-accent: #336699;
  --rf-accent-rgb: 228, 87, 46;
  --rf-sidebar-w: 270px;
  --rf-nav-h: 60px;
  --rf-radius: 14px;
  --bs-font-sans-serif: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --bs-primary: var(--rf-accent);
  --bs-primary-rgb: var(--rf-accent-rgb);
  --bs-link-color: #c2410c;
  --bs-link-color-rgb: 194, 65, 12;
  --bs-link-hover-color: #9a3412;
  --bs-link-hover-color-rgb: 154, 52, 18;
  --rf-surface: #ffffff;
  --rf-border: rgba(15, 23, 42, .08);
  --rf-shadow: 0 1px 2px rgba(15, 23, 42, .04), 0 4px 16px rgba(15, 23, 42, .05);
}

[data-bs-theme="dark"] {
  --bs-body-bg: #0f1216;
  --bs-link-color: #fb923c;
  --bs-link-color-rgb: 251, 146, 60;
  --bs-link-hover-color: #fdba74;
  --bs-link-hover-color-rgb: 253, 186, 116;
  --rf-surface: #171b21;
  --rf-border: rgba(255, 255, 255, .08);
  --rf-shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 4px 16px rgba(0, 0, 0, .25);
}

body {
  background: var(--bs-body-bg);
  -webkit-font-smoothing: antialiased;
}

.btn-primary {
  --bs-btn-bg: var(--rf-accent);
  --bs-btn-border-color: var(--rf-accent);
  --bs-btn-hover-bg: #cf4a22;
  --bs-btn-hover-border-color: #cf4a22;
  --bs-btn-active-bg: #b9421d;
  --bs-btn-active-border-color: #b9421d;
  --bs-btn-focus-shadow-rgb: var(--rf-accent-rgb);
}

/* ---------- Navbar ---------- */
.rf-navbar {
  height: var(--rf-nav-h);
  background: color-mix(in srgb, var(--rf-surface) 82%, transparent);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--rf-border);
}

.rf-brand {
  font-weight: 700;
  letter-spacing: -.02em;
  display: flex;
  align-items: center;
  gap: .55rem;
  color: var(--bs-emphasis-color);
  text-decoration: none;
}

.rf-brand-mark {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  display: grid;
  place-items: center;
  color: #fff;
  background: linear-gradient(135deg, #f97316, var(--rf-accent));
  box-shadow: 0 4px 12px rgba(var(--rf-accent-rgb), .35);
}

.rf-navbar .nav-link {
  color: var(--bs-secondary-color);
  font-weight: 500;
  border-radius: 999px;
  padding: .45rem .9rem;
  transition: background-color .15s, color .15s;
}

.rf-navbar .nav-link:hover,
.rf-navbar .nav-link.active {
  color: var(--bs-emphasis-color);
  background: var(--bs-tertiary-bg);
}

.rf-icon-btn {
  width: 40px;
  height: 40px;
  display: inline-grid;
  place-items: center;
  border-radius: 50%;
  border: 0;
  background: transparent;
  color: var(--bs-body-color);
}

.rf-icon-btn:hover { background: var(--bs-tertiary-bg); }

/* ---------- Layout ---------- */
.rf-shell { padding-top: var(--rf-nav-h); }

.rf-sidebar {
  --bs-offcanvas-width: var(--rf-sidebar-w);
  --bs-offcanvas-bg: var(--rf-surface);
}

@media (min-width: 992px) {
  .rf-sidebar {
    position: fixed;
    top: var(--rf-nav-h);
    bottom: 0;
    left: 0;
    width: var(--rf-sidebar-w);
    border-right: 1px solid var(--rf-border);
    overflow-y: auto;
  }
  .rf-main { margin-left: var(--rf-sidebar-w); }
}

.rf-sidebar .nav-link {
  display: flex;
  align-items: center;
  gap: .7rem;
  padding: .55rem .8rem;
  border-radius: 10px;
  color: var(--bs-body-color);
  font-weight: 500;
}

.rf-sidebar .nav-link i { color: var(--bs-secondary-color); font-size: 1.05rem; }
.rf-sidebar .nav-link:hover { background: var(--bs-tertiary-bg); }
.rf-sidebar .nav-link:hover i { color: var(--rf-accent); }

.rf-sidebar-label {
  font-size: .72rem;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--bs-secondary-color);
  padding: 0 .8rem;
  margin: 1.25rem 0 .4rem;
}

/* ---------- Hero ---------- */
.rf-hero {
  border-radius: var(--rf-radius);
  padding: 2rem;
  color: #fff;
  background:
    radial-gradient(900px 300px at 100% 0%, rgba(255, 255, 255, .18), transparent 60%),
    linear-gradient(135deg, #f97316 0%, var(--rf-accent) 55%, #be3a1a 100%);
  box-shadow: 0 10px 30px rgba(var(--rf-accent-rgb), .25);
}

.rf-hero h1 { letter-spacing: -.03em; font-weight: 800; }
.rf-hero .btn-light { color: #9a3412; font-weight: 600; }

/* ---------- Cards ---------- */
.rf-card {
  background: var(--rf-surface);
  border: 1px solid var(--rf-border);
  border-radius: var(--rf-radius);
  box-shadow: var(--rf-shadow);
}

.rf-stat { padding: 1rem 1.25rem; }
.rf-stat .num { font-size: 1.6rem; font-weight: 700; letter-spacing: -.02em; line-height: 1.1; }

.rf-board {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.25rem;
  color: inherit;
  text-decoration: none;
  transition: background-color .15s;
}

.rf-board + .rf-board { border-top: 1px solid var(--rf-border); }
.rf-board:hover { background: var(--bs-tertiary-bg); color: inherit; }
.rf-board:first-child { border-radius: var(--rf-radius) var(--rf-radius) 0 0; }
.rf-board:last-child { border-radius: 0 0 var(--rf-radius) var(--rf-radius); }

.rf-board-icon {
  flex: none;
  width: 46px;
  height: 46px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  font-size: 1.3rem;
  background: rgba(var(--rf-accent-rgb), .12);
  color: var(--rf-accent);
}

.rf-board-title { font-weight: 600; color: var(--bs-emphasis-color); }

.rf-avatar {
  width: 36px;
  height: 36px;
  flex: none;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: .8rem;
  font-weight: 700;
  color: #fff;
  background: var(--av, #64748b);
}

.rf-topic { padding: .9rem 1.25rem; display: flex; gap: .9rem; align-items: center; }
.rf-topic + .rf-topic { border-top: 1px solid var(--rf-border); }
.rf-topic a.title { font-weight: 600; color: var(--bs-emphasis-color); text-decoration: none; }
.rf-topic a.title:hover { color: var(--rf-accent); }

.rf-tag {
  font-size: .72rem;
  font-weight: 600;
  padding: .2rem .55rem;
  border-radius: 999px;
  background: var(--bs-tertiary-bg);
  color: var(--bs-secondary-color);
}

.rf-search .form-control {
  border-radius: 999px;
  background: var(--bs-tertiary-bg);
  border-color: transparent;
  padding-left: 2.4rem;
}

.rf-search .form-control:focus {
  background: var(--rf-surface);
  border-color: var(--rf-accent);
  box-shadow: 0 0 0 .25rem rgba(var(--rf-accent-rgb), .18);
}

.rf-search i {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--bs-secondary-color);
  pointer-events: none;
}

@media (max-width: 575.98px) {
  .rf-hero { padding: 1.4rem; }
  .rf-board { padding: .9rem 1rem; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}